package crawler.web.engine;

import crawler.web.beans.CrawlURL;

/**
 * 可以用来做内容过滤
 * 
 * @author waynechen Feb 7, 2012 10:35:14 PM
 */
public interface VisitedFrontier {

	void add(CrawlURL value);

	void add(String value);

	boolean contains(CrawlURL value);

	boolean contains(String value);

	boolean findAndAdd(String url);

}
